Add a method to the Turtle class to draw a letter.

Note: Each individual method ends ensuring the turtle is looking straight up so that it will work for the assumptions made by the next method.

```
class MyTurtle(Turtle):

#Assumes the turtle starts looking straight up
def drawM(self, size=60):
self.forward(size)
self.turn(150)
self.forward(size)
self.turn(-120)
self.forward(size)
self.turn(150)
self.forward(size)
self.turn(180)
```